Rafdal and Allen would fit the "redzone nightmare" characteristic that many people are calling McGriff.
Yes, none of them have done anything because they are underclassmen and we have had JR, SR, SR featured at the position for the past 3 years. Stoll looked to do a pretty solid job last year. You may be correct that they don't fit Frost's needs, but you don't know that for sure. Your post says as much anyways.
The position isn't lacking depth, that's for damn sure.